Users of Mac OS X system may at times come across hanging system screen at startup that stays thereitself occupying the computer screen and at the same time generates ‘out of range’ error messages. The screen may even stop momentarily and turn black afterwards. Mistakenly it is often observed as an resolution issue, however the actual cause is different and quite complicated one that is corruption of file system. So, even hard attempt to repair and resolve the problem fails and data remains inaccessible until mac data recovery software is used.
What leads to out of range error at mac system startup?
• Corruption of OS and associated application
• Corrupt directory structure
• Master boot record & boot sector corruption
• Virus infection and alike
However, irrespective of this to extract and retrieve lost, missing and inaccessible data, data recovery has to be done. Besides, that some of the below mentioned steps may help you fix the error received –
• Booting system in safe mode
• Then from apple menu select system preferences
• Now click the ‘displays’ option for opening preferences pane
• Now ‘refresh rate’ supported by the system is to be selected
• After that try to start the system once again
Persistence of the problematic issue makes it necessary to format the system and reinstall OS X. Following this data has to be restored from backup, if not mac data recovery software can be used for the purpose in order to scan and analyze he damaged disk and save and retrieve data from it.

